如何使用当前日期减去时间戳来获取提醒日期？

Question

我想使用时间戳和当前日期得到一个提醒的日子。想知道我是否可以使用这些简单的减法。

如何计算currentdate -t​​imestamp？

Answer 1

PHP的时间戳与Unix时间戳相同 - 自1970年1月1日以来的秒数。所以是的，一个简单的减法会给你一个秒钟的时间差，你可以通过潜水86,400（一天中的秒数） ：

$days = (time() - $oldtimestamp)/86400; 

Answer 2

尝试这种情况：

// Will return the number of days between the two dates passed in 
function count_days($a, $b) 
{ 
    // First we need to break these dates into their constituent parts: 
    $gd_a = getdate($a); 
    $gd_b = getdate($b); 
    // Now recreate these timestamps, based upon noon on each day 
    // The specific time doesn't matter but it must be the same each day 
    $a_new = mktime(12, 0, 0, $gd_a['mon'], $gd_a['mday'], $gd_a['year']); 
    $b_new = mktime(12, 0, 0, $gd_b['mon'], $gd_b['mday'], $gd_b['year']); 
    // Subtract these two numbers and divide by the number of seconds in a 
    // day. Round the result since crossing over a daylight savings time 
    // barrier will cause this time to be off by an hour or two. 
    return round(abs($a_new - $b_new)/86400); 
} 

Answer courtesy of the Doc

Answer 3

还有使用的，优选的，选择210和DateInterval类。

$now = new DateTime; 
$then = new DateTime; 
$then->setTimestamp($timestamp); 

$diff = $now->diff($then); 
echo $diff->days; 

以上也将提供的年数，月，日等应那些是你的兴趣（以及天总数如图所示）。